Move blog composition from Python to .sx defcomps (Phase 4)

- Settings form: ~135 lines raw HTML → ~blog-settings-form-content defcomp
- Data introspection: ~110 lines raw HTML → ~blog-data-table-content with
  recursive ~blog-data-model-content defcomps, Python extracts ORM data only
- Preview: sx_call composition → ~blog-preview-content defcomp
- Entries browser: ~65 lines raw HTML → ~blog-entries-browser-content +
  ~blog-calendar-browser-item + ~blog-associated-entries-from-data defcomps
- Editor panels: sx_call composition in both helpers.py and renders.py →
  ~blog-editor-content and ~blog-edit-content composition defcomps
- renders.py: 178 → 25 lines (87% reduction)
- routes.py _render_associated_entries: data extraction → single sx_call

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blog/bp/post/admin/routes.py

@@ -190,54 +190,14 @@ def _render_calendar_view(
 def _render_associated_entries(all_calendars, associated_entry_ids, post_slug: str) -> str:
     """Render the associated entries panel."""
     from shared.browser.app.csrf import generate_csrf_token
-    from quart import url_for as qurl
+    from sxc.pages.helpers import _extract_associated_entries_data
 
     csrf = generate_csrf_token()
+    entry_data = _extract_associated_entries_data(
+        all_calendars, associated_entry_ids, post_slug)
 
-    has_entries = False
-    entry_items: list[str] = []
-    for calendar in all_calendars:
-        entries = getattr(calendar, "entries", []) or []
-        cal_name = getattr(calendar, "name", "")
-        cal_post = getattr(calendar, "post", None)
-        cal_fi = getattr(cal_post, "feature_image", None) if cal_post else None
-        cal_title = getattr(cal_post, "title", "") if cal_post else ""
-
-        for entry in entries:
-            e_id = getattr(entry, "id", None)
-            if e_id not in associated_entry_ids:
-                continue
-            if getattr(entry, "deleted_at", None) is not None:
-                continue
-            has_entries = True
-            e_name = getattr(entry, "name", "")
-            e_start = getattr(entry, "start_at", None)
-            e_end = getattr(entry, "end_at", None)
-
-            toggle_url = host_url(qurl("blog.post.admin.toggle_entry", slug=post_slug, entry_id=e_id))
-
-            img_sx = sx_call("blog-entry-image", src=cal_fi, title=cal_title)
-
-            date_str = e_start.strftime("%A, %B %d, %Y at %H:%M") if e_start else ""
-            if e_end:
-                date_str += f" \u2013 {e_end.strftime('%H:%M')}"
-
-            entry_items.append(sx_call("blog-associated-entry",
-                confirm_text=f"This will remove {e_name} from this post",
-                toggle_url=toggle_url,
-                hx_headers=f'{{"X-CSRFToken": "{csrf}"}}',
-                img=img_sx, name=e_name,
-                date_str=f"{cal_name} \u2022 {date_str}",
-            ))
-
-    if has_entries:
-        content_sx = sx_call("blog-associated-entries-content",
-            items=SxExpr("(<> " + " ".join(entry_items) + ")"),
-        )
-    else:
-        content_sx = sx_call("blog-associated-entries-empty")
-
-    return sx_call("blog-associated-entries-panel", content=content_sx)
+    return sx_call("blog-associated-entries-from-data",
+        entries=entry_data, csrf=csrf)
 
 
 def _render_nav_entries_oob(associated_entries, calendars, post: dict) -> str: